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Drupal的网站,我们正在SQL查询的数据导出非常慢(长期服用)问题如何解决问题查询获取结果
查询如下
SELECT DISTINCT(a.*), c.nid, b.uac_inst_campus_cricos
FROM uac_export_coursetable_latest AS a
LEFT JOIN uac_institutiondata AS c
ON c.uac_institutiondata_institution = a.uac_course_institution
LEFT JOIN uac_inst_campus_latest AS b
ON b.nid = c.nid AND b.uac_inst_furtherinfobox_heading = a.campusname
WHERE a.uac_course_institution = '6628'
AND intyear12 = 'Yes'
ORDER BY uaccoursecode